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Type 1 Diabetes
CGM average blood glucose doesn't match A1C
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<blockquote data-quote="Auto E" data-source="post: 2180904" data-attributes="member: 513396"><p>I do not have type I diabetes, but I am posting this question here because I suspect many of you are CGM experts at this point.</p><p></p><p>My A1C by blood draw was 6% (42), but my CGM is giving me an average blood glucose of 104mg/dL (5.8mmol/L)! That is WAY lower than 6% - I would think my A1C would be more like 5.2% (34mmol/L). I get that there is variability, I get it that RBCs have varying longevity from person to person, I get that the size of the RBCs can cause variability, but wouldn't you agree that this is very very different than expected? Also note - my diet has been the same for 18 months, so I'm stymied by this.</p><p></p><p>So, the above paragraph is my primary question. But I do have a second question: my CGM has a GMI (glucose management index) of 5.8%/41mmol/L. That ALSO confuses me, because when I look that value up, the estimated glucose is 119mg/dL (or 6.65mmol/L). Why would they give such a high GMI when they report my average blood glucose at 104mg/dL/5.8mmol/L?</p><p></p><p>I think I will call Dexcom up this week to ask for help, but insight from this forum would be appreciated as well.</p></blockquote><p></p>
[QUOTE="Auto E, post: 2180904, member: 513396"] I do not have type I diabetes, but I am posting this question here because I suspect many of you are CGM experts at this point. My A1C by blood draw was 6% (42), but my CGM is giving me an average blood glucose of 104mg/dL (5.8mmol/L)! That is WAY lower than 6% - I would think my A1C would be more like 5.2% (34mmol/L). I get that there is variability, I get it that RBCs have varying longevity from person to person, I get that the size of the RBCs can cause variability, but wouldn't you agree that this is very very different than expected? Also note - my diet has been the same for 18 months, so I'm stymied by this. So, the above paragraph is my primary question. But I do have a second question: my CGM has a GMI (glucose management index) of 5.8%/41mmol/L. That ALSO confuses me, because when I look that value up, the estimated glucose is 119mg/dL (or 6.65mmol/L). Why would they give such a high GMI when they report my average blood glucose at 104mg/dL/5.8mmol/L? I think I will call Dexcom up this week to ask for help, but insight from this forum would be appreciated as well. [/QUOTE]
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Type 1 Diabetes
CGM average blood glucose doesn't match A1C
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